Villain? No, I'll catch up with the protagonist after passing the civil service exam.

"To die without a burial place?"

Lu Jingyan held the letter that smelled of spicy snacks and raised an eyebrow.

This familiar, overly dramatic threat instantly pulled him out of his previous inexplicable emotions.

He felt as if he were not facing a vicious avenger, but rather grading a primary school student's failing Chinese homework.

"Captain Lu, what is this?"

After finishing his chores, Zhao Tiezhu noticed the "evidence" on Lu Jingyan's table and approached it. When he saw the crooked handwriting and bloody threat on the paper, his face instantly darkened.

"Damn it! Who's behind this now?"

Zhao Tiezhu slammed his fist on the table, making the pens in the pen holder dance. "Is it that Bai Lu or Xiao Huohuo's brainwashed fans are still up to no good? Or... have Su Man's people come to attack?"

He instantly conjured up a million possibilities, each one fraught with bloodshed and carnage.

"These bastards have really got some nerve! Daring to threaten our special investigation team! Captain Lu, don't worry about it, leave this to me! I guarantee I'll find the scum who wrote this letter within three days and teach him a lesson he won't forget!"

Zhao Tiezhu was filled with righteous indignation and rolled up his sleeves to check the surveillance footage.

"Don't rush."

Lu Jingyan waved his hand, signaling him to calm down.

He picked up the letter, examined it carefully under the light, and then smelled it.

That familiar, cheap sweet and spicy flavor became even clearer.

"Tiezhu, do you think a professional assassin or gangster would issue a challenge in this way?"

"Uh..." Zhao Tiezhu paused for a moment, "It seems... a bit too... retro?"

"This isn't retro, it's outdated."

Lu Jingyan picked up the letter, pointed to the crooked words glued on it, and said in a tone full of contempt for the perpetrator's professional skills.

"Look at the edges of this clipping. They're rough and uneven, clearly cut with those safety scissors meant for elementary school students. And the glue used is the most common 'Chenguang' brand solid glue on the market, which has poor adhesion and is easy to peel off."

He pointed to a barely perceptible oil stain below the word "death".

"Most importantly, there are obvious oil stains here and here. I just smelled it, and it smells like 'Weilong' brand large gluten noodles, the kind that costs 50 cents a pack."

Zhao Tiezhu listened in a daze, feeling as if he were listening to a craft class rather than a case analysis.

"so what?"

"Therefore, the person who wrote this letter is most likely an immature, junk food-loving, and extremely inept...minor."

Lu Jingyan pushed up his glasses and gave a conclusion that nearly made Zhao Tiezhu's jaw drop.

"Under...minor?"

Zhao Tiezhu stared wide-eyed at the letter in disbelief. "Impossible! What brat is so bold as to write a threatening letter to the police?"

"Why is it impossible?"

Lu Jingyan leaned back in his chair, a playful smile curving his lips. "Have you forgotten that 'keyboard warrior' who, for Xiao Huohuo's sake, clamored online to Photoshop a portrait of me into a funeral portrait?"

"In their world, 'intimidation' and 'threats' are as simple as using a skill in a game; they have no idea how serious this behavior is."

"and……"

Lu Jingyan's gaze fell on the sentence, "Don't bully Sister Su Xiaoxiao."

His gaze became somewhat subtle.

Su Xiaoxiao... is she my older sister?

It seems that this is still a mischievous child with a "protective instinct".

"Captain Lu, what... what do we do now?" Zhao Tiezhu scratched his head. "We can't really go and drag an elementary school student back, can we? If word gets out, where will our special investigation team put its face?"

"Who said they were going to arrest them?"

Lu Jingyan smiled, a smile that sent a chill down Zhao Tiezhu's spine for no apparent reason.

He knew that every time the captain showed that smile, it meant... someone was about to be in big trouble.

"For these 'problem children,' simply arresting and criticizing them is useless."

Lu Jingyan stood up and took out a brand-new pair of white gloves and a set of professional trace evidence examination tools from the evidence cabinet next to him.

"You have to make him realize his mistake from the root in the way that is most unexpected and most frightening to him."

He walked to the desk and carefully laid the letter flat on the surface.

"Do you know why Xiaoxiao ran out crying just now?" Lu Jingyan suddenly asked.

"Huh?" Zhao Tiezhu was taken aback, then his face flushed red. "That...it's not because of you...your 'suspension bridge effect'..."

That's just the surface.

Lu Jingyan turned on the investigation light, and the blue-purple light instantly enveloped the letter. "The root cause is that I pointed out her lack of professional rigor. For a proud technical police officer like her, this is more painful than being directly rejected."

"Different methods are needed to deal with different people."

Lu Jingyan put on goggles, picked up a fingerprint scanner, and began to meticulously extract traces from the thin sheet of paper.

The movements were professional, meticulous, and full of scientific beauty.

"To deal with a domineering CEO, you have to use the law to shatter his money mentality."

"To deal with a miracle doctor, we must use science to expose his mysticism."

"And dealing with a self-important kid who likes to imitate crime movies..."

A devilish smile curled at the corners of Lu Jingyan's mouth.

"Then we must use the most professional criminal investigation methods to thoroughly expose and repeatedly humiliate his proud 'counter-investigation' skills."

"I want him to see with his own eyes just how utterly vulnerable his outdated criminal methods, learned from movies, are in the face of the real state apparatus."

Zhao Tiezhu stood aside, watching Lu Jingyan working intently under the blue light, barely daring to breathe.

He suddenly felt a little sorry for the brat who wrote the letter.

Of all people to mess with, you had to provoke this living devil who treats solving cases as a pleasure.

Now, it's not just a matter of "dying without a burial place."

I estimate that even the amount of homework during winter break will double.

"Got it."

Lu Jingyan suddenly stopped moving.

Under the illumination of the surveying lamp, a blurry but complete fingerprint was clearly revealed in an extremely inconspicuous spot on the lower right corner of the letter, stained with the oil from a spicy snack.

It was a child's fingerprint, small, round, and full of... innocence.

Lu Jingyan picked up the tweezers and carefully removed the piece of paper with fingerprints on it, placing it into the evidence bag.

He straightened up, took off his goggles, and gave a "game over" smile.

"Iron Pillar".

"arrive!"

"Send this to the technical department and let Xiaoxiao do a comparison."

Lu Jingyan handed him the evidence bag. "Tell her not to cry. She has work to do now."

"Let's start with this fingerprint."

"Make her go through the internet and dig up all the ancestors of this 'protector of flowers' for me."